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08-19-2016, 09:30 AM
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#15
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Senior Member
Join Date: Jan 2009
Posts: 5,398
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I usually level first, then put the slide out. But because i know that extending the slide does cause the motorhome to end up lower on that side, i initially raise it a teensy bit higher. I've gotten used to this and have become pretty good at not having to go back and relevel.
I would say it depends on the jacks. With our hydraulics, i can feel movement when i move inside the coach abruptly. The jacks are "giving" a tad so it makes sense to me that they will give when the extra weight of the slide is put upon them.
To the OP, relevel as necessary.
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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08-19-2016, 02:33 PM
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#16
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Senior Member
Join Date: Mar 2011
Location: Amory, Ms
Posts: 1,112
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Hydraulic jacks are held extended by pressure but the fluid is not a solid so it does compress when additional weight and leverage is added. The compression is very slight, rubber hydraulic line will expand also. This compression is minute but a tenth of an inch at the jack could be over an inch at the outside edge of a slide. There is also a small amount of flex in a coaches chassis that will seem unlevel after extending the slides. If it feels unlevel, relevel it.
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Roger And Kim Goodwin
bout them DAWGS!!
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08-19-2016, 03:11 PM
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#17
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Senior Member
Join Date: Jun 2013
Posts: 423
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Quote:
Originally Posted by Roger G
Hydraulic jacks are held extended by pressure but the fluid is not a solid so it does compress when additional weight and leverage is added. The compression is very slight, rubber hydraulic line will expand also. This compression is minute but a tenth of an inch at the jack could be over an inch at the outside edge of a slide. There is also a small amount of flex in a coaches chassis that will seem unlevel after extending the slides. If it feels unlevel, relevel it.
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Hydraulic fluid, like all liquids, are not compressible.
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08-19-2016, 03:21 PM
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#18
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Senior Member
Join Date: Jan 2009
Posts: 5,398
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Quote:
Originally Posted by Roger G
Hydraulic jacks are held extended by pressure but the fluid is not a solid so it does compress when additional weight and leverage is added. The compression is very slight, rubber hydraulic line will expand also. This compression is minute but a tenth of an inch at the jack could be over an inch at the outside edge of a slide. There is also a small amount of flex in a coaches chassis that will seem unlevel after extending the slides. If it feels unlevel, relevel it.
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Yes, after i reread my post i started to edit. The jacks themselves, unless air somehow got into the system, should not "give". I figure the hydraulic lines themselves are what expand. Whatever the cause, i can feel slight movement if we move about too abruptly.
I never thought about jacks being a fulcrum but it kinda makes sense that this could be a factor as well.
Again though, no matter the reason, the OP can relevel as he sees fit.
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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08-19-2016, 03:23 PM
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#19
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Member
Join Date: May 2016
Posts: 64
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Quote:
Originally Posted by peterson
Hydraulic fluid, like all liquids, are not compressible.
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Simple physics, however when you move x amount of lbs further out (increasing the arm and increasing ft lbs) you are relieving pressure on the opposite jacks which will let them rise, thus requiring you to re-level. Actually thinking about this the same thing can happen with mechanical jacks, Now I know why my 5r is not level after extending the slide, thanks for the subject.
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2006 28' Durango 5th wheel
2006 Dodge 2500 5.9 Cummins
K6JFN
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08-19-2016, 04:45 PM
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#20
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Senior Member
Join Date: Dec 2012
Location: Full Timing
Posts: 751
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Quote:
Originally Posted by peterson
Hydraulic fluid, like all liquids, are not compressible.
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True, but I think the poster is correct when he surmises the hoses can expand slightly. Also, any mechanical engineer will tell nothing is 100% rigid. There may be a small amount of flex in the jack mounts and the chassis itself. Cantilevering a slide 18" or more from the coach body can exert considerable force.
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Mike
2003 Alpine Coach 40MDTS - 400HP Cummins ISL
Can Am Spyder Roadster
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08-19-2016, 04:48 PM
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#21
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Senior Member
Winnebago Owners Club
Join Date: Mar 2014
Posts: 14,891
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We do.
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Gordon and Janet
Tour 42QD/InTech Stacker
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08-20-2016, 07:54 AM
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#22
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Senior Member
Join Date: Sep 2014
Location: Poulsbo, WA
Posts: 749
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We also have two slides on the drivers side and deploy the jacks prior to extending the slides. Often there is a bit of an off balance created. Here's a question...
Best to raise the slide side to level or lower the passenger side? Or doesn't it matter?
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Bill and Debb---2010 CT Coachworks Siena 35V
1999 Jeep Cherokee Sport---Roadmaster Falcon 5250 -
1 Cavalon (Scooby) 1 Papipoo (Bella- DOB 5/06/18)
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08-20-2016, 08:35 AM
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#23
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Senior Member
Join Date: Jan 2009
Posts: 5,398
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Quote:
Originally Posted by Wbonsell
We also have two slides on the drivers side and deploy the jacks prior to extending the slides. Often there is a bit of an off balance created. Here's a question...
Best to raise the slide side to level or lower the passenger side? Or doesn't it matter?
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I'd say it depends on whether or not you can lower just the side needing it. On mine, i cannot retract one or even a side of jacks by themselves. It's all or nothing. Normally,, for us at least, i end up extending the jacks on the side that is low.
Now, there are times when i feel i can relevel at a lower level. In other words, to get the coach closer the ground. I might hit the "all up" button to retract the jacks and stop the process within two or three seconds. Then relevel, hopefully at lower coach height.
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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08-20-2016, 03:50 PM
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#24
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Senior Member
Join Date: May 2006
Location: SoCal
Posts: 1,123
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Always check after sliding out, never needed to relevel
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2020 Grand Design Reflection 315RLTS
2019 GMC Sierra Denali Duramax
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